1: nBu4NF / tetrahydrofuran / 2 h / 20 °C 2: 92 percent / Jones' reagent / acetone / 0.17 h / 0 °C 3: MeONa / methanol / 1 h / 20 °C 4: 1) nBuLi / 1) THF, hexane, -20 deg C, 20 min, 2a) -78 deg C to -20 deg C, 30 min, b) -20 deg C, 15 min 5: 65 percent / PPh3 / Pd(OAc)2 / toluene / 1 h / 100 °C View Scheme